HTTP to HTTPS

Fantastic! There are lots of pages over there linking via HTTP to PDFs I want to read, but recent draconian security measures in Chrome consider them a threat and bock downloading. This extension is a superb workaround.

the best of best

Does what it says it does, it is excellent. You could make it to where it just displays a warning before you can visit a site that has HTTP only, like HTTPS Everywhere does, but it's still a great extension.